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Seismological Properties of Evolutionary Delta Scuti Models Using OPAL Opacities

Published online by Cambridge University Press:  12 April 2016

Joyce A. Guzik  and
Paul A. Bradley
Joyce A. Guzik
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
Paul A. Bradley
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545

Abstract

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We present the first results of our project of calculating the evolutionary and seismological properties of δ Scuti models using Livermore OPAL opacities. We calculate the radial and low-degree nonradial nonadiabatic pulsation frequencies for a 1.8 and 2.0M⊙ model. Our radial first overtone/fundamental mode period ratios are × 0.772, which agree well with observed period ratios. We find a dense spectrum of unstable nonradial modes including both low order g-type modes and low to intermediate order p—type modes, confirming that we need a selection mechanism allowing only some modes to grow to observable amplitudes.

Type
Part 1. The Scientific Programme
Information
International Astronomical Union Colloquium , Volume 155 , 1995 , pp. 92 - 93
Copyright
Copyright © Astronomical Society of the Pacific 1995

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